var a;
var b,c,d;
var e =20;
var f =20,g =30,h;
var a1 = 5;
var a2 = 6;
var a_5 = 39;
var a5_ = 3
var a = 20.45;
var b =25;
document.write(typeof a);
var str ='hello,world';
var str2 ="你好，世界";
document.write("<br>");
document.write(str);
document.write("<br>");
document.write(typeof str);

document.write(str2);

//Uncaught SyntaxError:Unexpected identifier

var str3 = 'hello,world'; 
document.write(str3);
document.write("<br>");


var str4 = '子曰:"有朋自远方来，不亦说乎"';
document.write(str4);

var str6 = "歪哥说：\"好好学习，能娶个好媳妇！\"";
var str7 = '歪哥说："好好学习"';
var str8 = "好好学习，\n能娶个好媳妇" ;
document.write(str6,str7,str8);
console.log("waige\n666");

var strL = "i" + "love" +"you";
document.write(strL);
 
var s1 = "1", s2 = "hate",s3 = "you";
var s4 = s1 + s2 + s3;
document.write(s4);
 
 var strr7 = 4 + 5 + "hello";
 document.write(strr7);

 var str8 = "4" + 6;
 document.write(str8);

 var str9 = "4" + 6 + 5 + "hello" + 8 + 9;
 document.write(str9);

 var name = "xiaozhuang";
 var age = 30;
 var denger = "nan";
document.write( "<br>" + "xingming:" + name + ",nianling:" + age + ",xingbie:" + denger);
   
   var b1 = true;
   var b2 = false;
   document.write(typeof b1);
var person = {
	name:"jjj",

} 

var r = str + "7";
document.write(r);

r = "5" - 0;
document.write(r);

x = 5 > 3;
document.write(x);

p = 5;
document.write(p++);
document.write(p);


